scholarly journals Effects of carbon black content on the microstructure and properties of carbon/ceramic conductive composites

2019 ◽  
Vol 53 (2) ◽  
pp. 245-250
Author(s):  
X. Gao ◽  
X. Zheng ◽  
J. Liu ◽  
S. Zhai ◽  
G. Yuan
Keyword(s):  
Carbon Black ◽  
Carbon Black Content ◽  
Microstructure And Properties ◽  
Conductive Composites ◽  
Carbon Ceramic

The Fluidity and AC Impedance of Polypropylene Composites Filled with Activated Carbon Black

2012 ◽  
Vol 217-219 ◽  
pp. 634-643
Author(s):  
Nai Xiu Ding ◽  
Li Li Wang ◽  
Mao Sheng Zhan ◽  
Lei Li ◽  
Shuai Feng Xu
Keyword(s):  
Fourier Transform ◽  
Activated Carbon ◽  
Infrared Spectroscopy ◽  
Carbon Black ◽  
Melt Flow Index ◽  
Ac Impedance ◽  
Flow Index ◽  
Carbon Black Content ◽  
Polypropylene Composites ◽  
Conductive Composites

In this paper, carbon black was activated by grafting and coupling respectively. Then the grafted carbon black, coupled carbon black, together with the unmodified carbon black were filled into polypropylene to prepare three kinds of composites respectively. The measurements of Fourier Transform Infrared Spectroscopy (FTIR), melt flow index, and alternating current (AC) impedance were performed on the composites. From the FTIR spectra, it was shown that different groups are bonded to the surface of carbon black after activating treatment For the corresponding conductive composites，it was found that the variation of fluidity with carbon black content and temperature changed after the carbon black activation. The influence of carbon black activation on the AC impedance and fluidity of the composites was analyzed. The scheme describing the interaction between carbon black and polypropylene in composites was given according to the results mentioned above.

Research on Electrical Double Percolation of Carbon Black-Filled Cement-Based Composites

2011 ◽  
Vol 311-313 ◽  
pp. 201-204
Author(s):  
Hong Zhong Ru ◽  
Ran Ran Zhao
Keyword(s):  
Carbon Black ◽  
Cement Paste ◽  
Volume Fraction ◽  
Carbon Black Particle ◽  
Carbon Black Content ◽  
Percolation Behavior ◽  
Key Factor ◽  
Binder Ratio ◽  
Black Particle ◽  
Double Percolation

Electrical conductive carbon black-filled cement-based composites are significant as multifunctional structural materials. Double percolation in carbon black-filled cement-based composites involves both carbon black particle percolation and cement paste percolation, which has great effect on the resistivity of composites. Based on double percolation theory, the influences of sand-binder ratio and carbon black volume fraction on the resistivity of carbon black-filled cement-based composites are investigated. The results show that besides carbon black volume fraction, sand-binder ratio is a key factor affecting double percolation behavior in carbon black-filled cement-based composites. At a fixed carbon black content in overall mortar, with increasing sand-binder ratio, the cement paste percolation though aggregate phase increases due to high obstruction of aggregate but the carbon black particle percolation in cement paste decreases. This is because that the microstructure of aggregate is impenetrable so that the carbon black particles are limited in cement paste, that is, the carbon black content in paste is compacted and large amount of conductive paths are generated by lapped adjacent carbon black particles in paste. The double percolation in the electrical conduction in carbon black-filled cement-based composites is observed when the carbon black volume fraction is 7.5% and sand-binder ratio is 1.4, and its resistivity is only 3200 Ωcm, so that a sand-binder ratio of 1.4 and 7.5% carbon black volume fraction or more are recommended for attaining high conductivity with a compromise between workability and conductivity.

Ultrasonic Measurements with Rubber Compounds during Extrusion

1979 ◽  
Vol 52 (2) ◽  
pp. 294-303 ◽  
Author(s):  
R. Caspary ◽  
P. Kretschmer
Keyword(s):  
Carbon Black ◽  
Sound Velocity ◽  
Specific Volume ◽  
Carbon Black Content ◽  
Rubber Compounds ◽  
Ultrasonic Measurements ◽  
Temperature And Pressure ◽  
Reciprocal Value

Abstract The dependence of the Index of Elasticity, E, the reciprocal value of sound velocity, on temperature and pressure is related to specific volume and compressibility of rubbers. The sensitivity of E towards changes of temperature and pressure was calculated, indicating a new versatile possibility for the control of rubber extruders. To confirm this, extruder experiments were carried out with an SHR compound, of which a working diagram was established showing the complete behavior of E=f(p,T). The effect of compound composition, especially of plasticizer and carbon black content, was examined. Viscosity in the extruder primarily determines changes in E. The method was shown to be applicable up to a die diameter of at least 200 mm. The method may also be applied to follow degradation of rubber compounds during mastication.

scholarly journals Mechanical Properties of Carbon Black-Filled Polymeric Concrete

1996 ◽  
Vol 5 (4) ◽  
pp. 096369359600500
Author(s):  
L. Rejón ◽  
M.A. Ponce ◽  
G. Vazquez-Polo ◽  
V.M. Castaño
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
Mechanical Performance ◽  
Carbon Black Content

Polymeric concrete, a recently patented material for electrical insulators, was modified by using various amounts of monomer in the resins employed and by adding different concentrarions of carbon black. The results show that there exists an optimal carbon black content in terms of the mechanical performance.

EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF MAGNETORHEOLOGICAL ELASTOMER

2016 ◽  
Vol 78 (5-4) ◽  
Author(s):  
Nurul Husna Rajhan ◽  
Hanizah Ab. Hamid ◽  
Azmi Ibrahim ◽  
Rozaina Ismail
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Tensile Strength ◽  
Carbon Black ◽  
Tensile Test ◽  
Magnetorheological Elastomer ◽  
Dead Load ◽  
Carbon Black Content ◽  
Engineering Applications ◽  
Magnetorheological Elastomers

Magnetorheological elastomers (MREs) have much interest in engineering applications. However, the mechanical properties of MREs are still under ongoing researches. This paper presents the results from tensile test, hardness and rebound test that were carried out in order to understand the mechanical properties of MRE with the influence of carbon black content. The addition of carbon black was varied with the amount of 20 pphr, 40 pphr and 60 pphr of carbon black. The development of the MRE composites was manufactured by following the conventional rubber compounding process. The optimum cure of each MRE composite was determined by using a Rheometer 100. The mechanical properties through tensile test were obtained by using an Instron Tensile Machine, meanwhile hardness and resilience were carried out by using Wallace Dead Load Hardness and Dunlop Tripsometer, respectively. The results of tensile strength were not consistent with the addition of carbon black. In meantime, hardness value increases as the carbon black increases. The decreasing pattern of MRE resilience could be observed when the carbon black content increases.

scholarly journals Charge Injection Characteristics of Semi-Conductive Composites with Carbon Black-Polymer for HVDC Cable

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1134 ◽  
Author(s):  
Yanhui Wei ◽  
Mingyue Liu ◽  
Wang Han ◽  
Guochang Li ◽  
Chuncheng Hao ◽  
...  
Keyword(s):  
Carbon Black ◽  
Electric Field ◽  
Bottom Electrode ◽  
Charge Injection ◽  
Experimental Results ◽  
Uniform Electric Field ◽  
Insulation Material ◽  
Electrode Structure ◽  
Depolarization Current ◽  
Conductive Composites

Semi-conductive composites composed of carbon black-polymer play an important role in uniform electric field in high voltage direct current (HVDC) cable. They also affect space charge behaviors in the insulation material. However, the charge injection characteristics of semi-conductive composites are not detailed. In this work, the electrode structure of ‘Semi-conductive composites- Insulation material- Metal bottom’ (S-I-M) is proposed, and the currents formed by injected charges from semi-conductive composites are characterized by the thermally stimulated depolarization current (TSDC) method. Further, the experimental results based on the structure of S-I-M are compared with the traditional electrode structure of M-I-M (Metal upper electrode- Insulation material- Metal bottom electrode) and the simplified cable electrode structure of MS-I-M (Metal upper electrode-Semi-conductive electrode- Insulation material- Metal bottom electrode), respectively. The experimental results show that the semi-conductive composite plays an important role in the charge injection process and it presents a different tendency under different compound modes of temperature and electric field. For the low electric field (E ≤ 5 kV/mm) and the low temperature (T ≤ 50 °C), the current caused by the accumulated charges follows the rule, IS > IMS > IM. For the low electric field and high temperature (T > 50 °C), the current caused by the injected charges follows the rule, IMS > IM > IS. This phenomenon is closely related to the interface characterization and contact barrier.

Polypropylene–Carbon black interaction in conductive composites

1993 ◽  
Vol 49 (9) ◽  
pp. 1659-1669 ◽  
Author(s):  
Zoran S. Petrović ◽  
Bratislav Martinović ◽  
Vladimir Divjaković ◽  
Jaroslava Budinski–Simendić
Keyword(s):  
Carbon Black ◽  
Conductive Composites
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